n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 26 |
5 | 237 |
6 | 2778 |
7 | 39805 |
8 | 674125 |
9 | 13174189 |
10 | 291802238 |
11 | 7223963796 |
12 | 197670359937 |
13 | 5924155984714 |
14 | 192988681624915 |
15 | 6789966027406003 |
16 | 256591956638230811 |
17 | 10365414610788266136 |
18 | 445744854494435066418 |
19 | 20330276980162447348231 |
20 | 980249560154126513379574 |
[1,1,4,26,237,2778,39805,674125,13174189, 291802238,7223963796,197670359937,5924155984714, 192988681624915,6789966027406003, 256591956638230811,10365414610788266136, 445744854494435066418,20330276980162447348231, 980249560154126513379574] |